<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title>
    <style>
        .thumbnail
        {
            float:left;
            width:110px;
            height:90px;
            margin:5px;
        }

        /*clear both 两侧不允许出现浮动元素*/
        .text_line
        {
            clear:both;
            margin-bottom:2px;
        }
    </style>
</head>

<body>
<h3>图片库</h3>
<p>试着调整窗口,看看当图片没有足够的空间会发生什么。.</p>
<img class="thumbnail" src="img_1.png" width="107" height="90">
<img class="thumbnail" src="img_1.png" width="107" height="80">
<img class="thumbnail" src="img_1.png" width="116" height="90">
<img class="thumbnail" src="img_1.png" width="120" height="90">
<h3 class="text_line">第二行</h3>
<img class="thumbnail" src="img_1.png" width="107" height="90">
<img class="thumbnail" src="img_1.png" width="107" height="80">
<img class="thumbnail" src="img_1.png" width="116" height="90">
<img class="thumbnail" src="img_1.png" width="120" height="90">
</body>
</html>